Physical-chemical traits, phytotoxicity and pathogen detection in liquid anaerobic digestates

Coêlho, Janerson José; Prieto, Maria Luz; Dowling, Stephen; Hennessy, Aoife; Casey, I. A.; Woodcock, Tony; Kennedy, Nabla

doi:10.1016/j.wasman.2018.05.017

Cited by 69 publications

(21 citation statements)

References 36 publications

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“…Anaerobic digestate, a co-product of biogas production, has been recognised as a potential type of biofertiliser, as it is a source of recycled macro-and micronutrients for plant growth (Tambone et al 2010;Alburquerque et al 2012;Möller and Müller 2012;Nkoa 2014;Coelho et al 2018). For certain types of crops (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The main fertiliser effects of anaerobic digestates are generally reported due to their concentrations of high amount of N and its plantavailable form of ammonium (NH 4 + ), as well as the concentrations of other plant nutrients (Alburquerque et al 2012;Möller and Müller 2012;Johansen et al 2013;Nkoa 2014;Coelho et al 2019a). Nevertheless, since there is much variability between physical-chemical compositions in the different types of anaerobic digestates being produced (Coelho et al 2018) and also the presence of complex microbial communities, including microbes with possible roles in plant growth biostimulation and soil nutrient cycling (e.g. plant growthpromoting bacteria (PGPB), arbuscular mycorrhizal fungi (AMF) and methanogens) (Coelho et al 2019b), there is a need to understand how these differences between anaerobic digestates influence their biofertiliser performance.…”

Section: Introductionmentioning

confidence: 99%

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Biofertilisation with Anaerobic Digestates: Effects on the Productive Traits of Ryegrass and Soil Nutrients

Coêlho

Hennessy

Casey

et al. 2020

J Soil Sci Plant Nutr

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This study investigated how repeated applications of different types of anaerobic digestates and undigested cattle slurry affected the growth responses and nutritional aspects of ryegrass swards (Lolium perenne L.) and soil nutrient concentrations, in a twoseason field trial. The treatments included four different types of anaerobic digestate, undigested cattle slurry, nitrogen control (Ncontrol) with calcium ammonium nitrate (CAN) and a no fertiliser control, distributed in a randomised block design with three replicates. The different types of biofertilisers drove a comparable average forage daily growth rate varying between 65 and 79 kg ha −1 day −1 (p > 0.05). Crude protein and neutral or acid detergent fibre of the forage were not influenced by any type of biofertiliser (p > 0.05). Most of the anaerobic digestates led to increases in the level of soil available P and K (p < 0.05). Despite the detectable influence of the levels of NPK in the biofertilisers on the plant growth responses, different anaerobic digestates when applied using the same dry matter amounts can drive comparable forage grass growth responses with low influence over the nutritional quality of the ryegrass forage. Repeated applications of anaerobic digestates can help to increase or reduce the losses of the soil available P and K. The application of anaerobic digestate, cattle slurry and calcium ammonium nitrate led to increases in the N content of the soil; however, there were no differences between them, despite their considerable differences in terms of N inputs. This might be linked to the volatility and losses of the readily available N from the biofertilisers applied.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biofertilisation with Anaerobic Digestates: Effects on the Productive Traits of Ryegrass and Soil Nutrients

Coêlho

Hennessy

Casey

et al. 2020

J Soil Sci Plant Nutr

Self Cite

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“…EC values of 3.62 dS/m was found in anaerobic fresh digestate which is further lowered to 1.81 dS/m after aerobic digestion process ( Figure 4B). EC can influence seed germination in contact with digestate, where lower EC is more favorable for seed germination (Coelho et al, 2018). This showed that EC of the digestate could be improved by post treatment of digestate in order to cause least negative effect in soil due to higher EC.…”

Section: Effect Of Aerobic Post Treatment Of Digestatementioning

confidence: 92%

“…Application of such high nutrient entities to the soil not only ensure the sound disposal of anaerobic byproducts, but also is an appealing solution to declining soil nutrient balance, which has identified as an important soil health problem worldwide (Galvez et al, 2012;Da Ros et al, 2018). However, the characteristic phytotoxicity limits the applications of anaerobic digestate as soil conditioner (Coelho et al, 2018). The fertilizer value of digestate can be enhanced by reducing its phytotoxic effects.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Co-digestion of Catering and Agro-Industrial Waste: A Step Forward Toward Waste Biorefinery

2018

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In the present study, a biorefinery system is proposed using catering and agro industrial waste for biogas and low phytotoxic digestate. Anaerobic co-digestion of catering waste with partially pre-treated (microwave 800 J/g/min + steam 121 • C 40 min) maize crop residues was conducted under different composition (20-50%) of feedstock. The results showed that the biogas production was increased by 2.03 times in co-digestion experiment (40% partially pre-treated maize crop residue + 60% catering waste: TCM3) as compared to catering waste alone (control). The increment in accumulative methane 116.7 m 3 t −1 was recorded in TCM3 which is due to improvement in biodegradation under co-digestion process. The post digestion byproduct (residual digestate) was evaluated for its phytotoxicity which is supplied with aerobic post treatment. The post treatment has improved the digestate quality by decreasing VS/TS ratio from 259 to 173 g/L and slightly increase the pH from 7.29 to 8.32. Seed germination assay showed that the germination percentage (G%), germination index (GI) and vigor index (VI) were relatively higher with post treated digesate as compared to untreated digestate. In the germination test using wheat seeds, the post treated digestate (5% sol. extract) achieved higher values of GI and VI (46 and 609) whereas in untreated , values for these indices were 14 and 62, respectively. Overall the findings of the present study identify the significance co-digestion based waste biorefinery, in order to development of value added bio-products such as biogas and biofertilizers.

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“…However, digestate may also contain other potentially toxic elements (PTEs) or compounds such as lead (Pb), zinc (Zn) and copper (Cu) (Coelho et al 2018). Essential nutrients and PTE concentrations present in the digestate vary depending on feedstock composition in AD plants.…”

Section: Challenges Of Applying Anaerobic Digestate As a Feedstockmentioning

confidence: 99%

Using microalgae in the circular economy to valorise anaerobic digestate: challenges and opportunities

Stiles

Styles

Chapman

et al. 2018

Bioresource Technology

161

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Managing organic waste streams is a major challenge for the agricultural industry. Anaerobic digestion (AD) of organicwastes is a preferred option in the waste management hierarchy, as this processcangenerate renewableenergy, reduce emissions from wastestorage, andproduce fertiliser material.However, Nitrate Vulnerable Zone legislation and seasonal restrictions can limit the use of digestate on agricultural land. In this paper we demonstrate the potential of cultivating microalgae on digestate as a feedstock, either directlyafter dilution, or indirectlyfromeffluent remaining after biofertiliser extraction. Resultant microalgal biomass can then be used to produce livestock feed, biofuel or for higher value bio-products. The approach could mitigate for possible regional excesses, and substitute conventional high-impactproducts with bio-resources, enhancing sustainability withinacircular economy. Recycling nutrients from digestate with algal technology is at an early stage. We present and discuss challenges and opportunities associated with developing this new technology.

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Physical-chemical traits, phytotoxicity and pathogen detection in liquid anaerobic digestates

Cited by 69 publications

References 36 publications

Biofertilisation with Anaerobic Digestates: Effects on the Productive Traits of Ryegrass and Soil Nutrients

Biofertilisation with Anaerobic Digestates: Effects on the Productive Traits of Ryegrass and Soil Nutrients

Anaerobic Co-digestion of Catering and Agro-Industrial Waste: A Step Forward Toward Waste Biorefinery

Using microalgae in the circular economy to valorise anaerobic digestate: challenges and opportunities

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